Sobolev classes Задача Боянова-Найдьонова - Boyanov-Naydenov problem поліноми сплайни Bojanov-Naidenov problem Boyanov-Naidenov problem Boyanov-Naydenov problem and Kolmogorov-type Boyanov-Naydenov problem and Kolmogorov-type inequalities and Relationship theorem Erd\ Inequalities of various metrics Kolmogorov type inequality Kolmogorov-type inequalities Relationship theorem Remez type inequalities Sharp Kolmogorov-Remez typy inequality Sharp Remez type inequality of various metric Sharp constant in Kolmogorov in Sobolev class of functions a class of functions with given comparison function classes of functions with a given comparison function function of a small smoothness inequalities of different metrics polynomial polynomials polynomials splines splines trigonometric polynomials and splines Бернштейна